key features: ? 5a output current ? ef ciency to 94% ? en 60950 approved (ul) ? miniature smt construction ? wide input range ? short circuit protected ? thermal shutdown ? remote on/off control ? industry standard footprint SRL05A-xx miniature surface mount 5a output, switching pol regulators series micropower direct 292 page street suite d stoughton, ma 02072 usa t: (781) 344-8226 f: (781) 344-8481 e: sales@micropowerdirect.com w: www.micropowerdirect.com electrical speci? cations speci cations typical @ +25?, nominal input voltage & rated output current, unless otherwise noted. speci cations subject to change without notice. www.micropowerdirect.com input parameter conditions min. typ. max. units input voltage range 5v input 3.0 5.0 5.5 vdc 12v input 8.3 12.0 14.0 under voltage lockout, power up 5v input 2.0 vdc 12v input 8.0 under voltage lockout, power down 5v input 1.9 vdc 12v input 7.9 input filter capacitive input re ected ripple current see note 1 150 ma p-p output parameter conditions min. typ. max. units output voltage/current see model selection guide output voltage tolerance ?.5 % line regulation, see note 2 5v input ?.4 % 12v input ?.2 load regulation i out = 0% to 100%, v out = 3.3 vdc ?.5 % ripple & noise (20 mhz) see note 3 50 mv p-p 20 mv rms transient recovery time, see note 4 50% load change 200 sec transient response deviation ?.0 % temperature coef cient ?.03 %/? short circuit protection continuous (hiccup mode) over temperature protection see note 5 120 ? overload protection see note 6 150 % general parameter conditions min. typ. max. units isolation voltage not isolated switching frequency fixed 300 khz remote on/off, see note 7 parameter conditions min. typ. max. units unit on logic high open or v in unit off logic low 0.0 0.4 vdc on/off current v on /v off = 0.0v 1 ma environmental parameter conditions min. typ. max. units operating temperature range ambient -40 +25 +85 ? storage temperature range -55 +125 ? cooling free air convection (see derating curves) humidity rh, non-condensing 93 % physical size 0.80 x 0.45 x 0.24 inches (20.3 x 11.43 x 6.09 mm) weight 0.081 oz (2.3g) reliability speci? cations parameter conditions min. typ. max. units mtbf mil hdbk 217f, 25?, gnd benign 1.5 mhours safety standards ul 60950, en 60950
model selection guide remote on/off notes: 1. measured over a bandwidth of 5 hz to 20 mhz using a 1 ? inductor. 2. line regulation is measured for a v in change from low line to high line, with v out set to 1.8 vdc. 3. output ripple is measured at 20 mhz bandwidth using a 1.0 ? ceramic capacitor and a 10 ? tantalum capacitor connected in parallel as close to the output terminals as possible. for the SRL05A-12-5.0, when set for a 5 vdc output, the output ripple and noise is: peak to peak 75 mv p - p rms 45 mv rms 4. transient recovery is measured to within a 1% error band for a 50% load change. 5. these units include a non-latching over temperature protection circuit. if the temperature exceeds approximately 120? at the monitored ?ot spot? the unit will be shut down. when the temperature decreases, the unit will automatically restart. 6. these units will provide up to 150% of rated current. in the event of an over current fault, the unit will go into hiccup mode until the fault is removed. 7. standard units feature an active high remote control input. see the note and diagram at right. 8. these units do not include an internal fuse. it is recommended that an external slow-blow fuse be used with a rating as shown in the table above. 292 page street ste d stoughton, ma 02072 tel: (781) 344-8226 fax: (781) 344-8481 e-mail: sales@micropowerdirect.com www.micropowerdirect.com SRL05A-05-3.3 v out (vdc) r trim (k) 0.75 open 1.20 41.71 1.50 22.98 1.80 14.96 2.00 11.75 2.50 6.93 3.30 3.15 3.63 2.20 model number input output ef? ciency (%, typ) capacitive load (f max) fuse rating slow-blow (a) voltage (vdc) current (ma) voltage (vdc) current (a, max) current (a, min) range full-load no-load SRL05A-05-3.3 3.0 - 5.5 949 25 0.75 5.0 0.0 79 3,000 10 1,412 30 1.20 85 1,724 30 1.50 87 2,022 35 1.80 89 2,222 35 2.00 90 2,217 35 2.50 92 4.5 - 5.5 3,511 35 3.30 94 SRL05A-12-5.0 8.3 - 14.0 428 20 0.75 5.0 0.0 73 3,000 7 625 25 1.20 80 762 25 1.50 82 893 30 1.80 84 980 30 2.00 85 1,197 35 2.50 87 1,545 45 3.30 89 2,264 50 5.00 92 these units include an active high on/off control input. the unit is ?n?if the input to the control pin (pin 2) is high; or if the pin is left open (or oating). the signal level of the control input is referenced to ground. a recommended drive circuit for the control pin is shown at left. the resistors r 1 & r 2 have been added to help reduce pos- sible false triggering of the control input due to leakage currents. units are available with an active low control input. with this input, the unit will remain off if the con- trol input remains above 2.8 vdc. for more information on the active low option, contact the factory. output voltage trim the output voltage of the SRL05A-05-3.3 models is adjustable over the range of 0.75 vdc to 3.63 vdc. the required resistor value for various output levels is given in the table above. to calculate the correct value for a different output level, the formula is: ( . , 5, 110) r v075 21 070 trim out = - - where: r trim = the external trim resistor v out = the desired output voltage if a trim resistor is not connected, the output goes to 0.75 vdc. the output voltage level of the SRL05A series is adjustable over a wide range by the simple addition of an external resistor. this trim resistor is connected between the circuit common and the trim input (pin 5), as shown in the diagram above. SRL05A-12-5.0 v out (vdc) r trim (k) 0.75 open 1.20 22.33 1.50 13.00 1.80 9.00 2.00 7.40 2.50 5.00 3.30 3.12 5.00 1.47 the output voltage of the SRL05A-12-5.0 models is adjustable over the range of 0.75 vdc to 5.00 vdc. the required resistor value for various output levels is given in the table above. to calculate the correct value for a different output level, the formula is: ( . , ,) r v075 10 500 1000 trim out = - - where: r trim = the external trim resistor v out = the desired output voltage if a trim resistor is not connected, the output goes to 0.75 vdc.
SRL05A-05-3.3 - v in = 5 vdc, v out = 3.3 vdc SRL05A-12-5.0 - v in = 12 vdc, v out = 5.0 vdc SRL05A-05-3.3 - v in = 5 vdc, v out = 2.5 vdc SRL05A-12-5.0 - v in = 12 vdc, v out = 3.3 vdc srl05-05a-3.3 - v in = 5 vdc, v out = 1.8 vdc SRL05A-12-5.0 - v in = 12 vdc, v out = 2.5 vdc SRL05A-05-3.3 - v in = 5 vdc, v out = 1.5 vdc SRL05A-12-5.0 - v in = 12 vdc, v out = 2.0 vdc SRL05A-05-3.3 - v in = 5 vdc, v out = 1.2 vdc SRL05A-12-5.0 - v in = 12 vdc, v out = 1.5 vdc SRL05A-05-3.3 - v in = 5 vdc, v out = 0.75 vdc SRL05A-12-5.0 - v in = 12 vdc, v out = 0.75 vdc temperature measurement derating curves these switching regulators may be used in a wide variety of thermal environments, but must be properly cooled to ensure long reliable operation. the derating curves shown above are approximations of the ambient temperature and air ow required to maintain the switching regulator temperature below its maximum rating. air ow should move across the unit, as shown at left. proper cooling can be veri ed by measuring the temperature at pin six of q 1 (as shown at left). the thermocouple should be mounted approximately 0.5 in. off the unit board. the temperature at this location should not exceed 110?. micropower direct 292 page street ste d stoughton, ma 02072 tel: (781) 344-8226 fax: (781) 344-8481 e-mail: sales@micropowerdirect.com www.micropowerdirect.com
mechanical dimensions notes: all dimensions are typical in inches (mm) tolerance x.xx = 0.02 ( 0.50) micropower direct we power your success - for less! 292 page street ste d stoughton, ma 02072 tel: (781) 344-8226 fax: (781) 344-8481 e-mail: sales@micropowerdirect.com www.micropowerdirect.com typical connection notes: fuse: SRL05A regulators do not include an internal fuse. for safety and protection, a external slow-blow fuse should be placed in the input (+vin) line. a 10a fuse is recommended for the SRL05A-05 and a 7a fuse for the SRL05A-12 . input filter: the unit must be connected to a low ac impedance source, and to avoid loop stability issues, the source inductance should also be low. to signi - cantly reduce ripple caused by the switching action of the pol, the SRL05A includes onboard ltering. however, adding input capacitors c1 and c2 will further reduce ripple currents (c1) and high frequency noise spikes (c2). these capacitors should be placed as close to the input pins as possible (see board layout at right). it is recommended that low esr (<100 m ) and low esl ceramic capacitors be used. recommended values are: c 1 c 2 33 f to 250 f 0.01 f remote on/off : see note on page 2 output trim : see note on page 2 output filter : output ltering is not required, but may be used to further reduce output ripple & n oise; or to adjust the transient response time of the unit. care must be taken not to exceed 3,000 f, the maximum value of output capacitance the unit is rated for. the values given in the connection diagram are typical for light ltering. suggested board layout this diagram illustrates a simple board layout for use with the SRL05A series. as recom- mended, external components are placed as close to the unit as possible. to help shield external circuitry, the ground plane has been extended under the unit. any signal traces should not be routed underneath the unit (unless they are on a layer under the ground plane) to avoid unwanted noise interference. suggested solder re? ow pro? le pin description pin description 1 +v input 5 trim 2 remote on/off 6 +v output 4 common pin connections
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